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Grading of raw coffee beans

Published: 2024-06-03 Author: World Gafei

Last Updated: 2024/06/03, There are two ways to classify raw coffee beans, one is the filter number, and the other is the elevation. It is divided by the filter number, and the size is size in terms of the screen size. Round beans are generally smaller than flat beans, between 8-13 and 12-29. 8, 9, 10. 12, 13. 18. 29 = small, medium, ordinary. Quasi-big. Big, extra large. The bigger the size, the bigger the beans. Like SC-.

There are two ways to classify raw coffee beans, one is the filter number, and the other is the elevation.

It is divided by the filter number, and the size is size in terms of the screen size.

Round beans are generally smaller than flat beans, between 8-13 and 12-29.

8, 9, 10. 12, 13. 18. 29 = > small, medium, ordinary. Quasi-big. Big, extra large.

The bigger the size, the bigger the beans. SC-19, for example, is the No. 19 bean.

Let's talk about the division of elevation. Elevation is Haipu. It is generally divided by abbreviations:

For example, H.B is a good coffee bean.

G.W is high quality washed coffee beans.

P.W is the best washed coffee beans.

H.B is 4000-4500 inches above sea level

Grading purpose: to make the size of raw beans uniform, which is conducive to the baking operation, and improve the value of raw beans.

Hierarchical treatment method

Get raw beans

Wet treatment: grind off the endocarp

Dry treatment: grind off the shell

Remove impurities: stone, dust, endocarp or shell debris

Use the air separator to adjust the wind speed and separate foreign bodies and other impurities

Remove bad beans

Broken beans, stunted beans, insect-infested beans, diseased beans, overripe beans, unripe beans

Using air separator to separate bad beans with different specific gravity and weight (broken beans, overripe beans, unripe beans)

Using artificial vision or computer color sorting machine to separate bad beans with little difference in specific gravity and weight but with color difference (insect infested beans, diseased beans).

Size sieve: a series of sieves ranging from small to large to separate raw beans of different sizes

Screen diameter

The size of the international practice is 9: 22, and the number used represents the screen diameter as the fraction with that number as the numerator and 64 as the denominator, in inches. For example, 14 refers to raw coffee beans that can be sifted through a 14-inch screen with a diameter of 64 inches, and 19 + refers to raw coffee beans that can be sifted with a diameter of more than 64 inches with a 19-inch screen.

Grading standard and code name

The governments of each coffee-exporting country set their own grading standards and code names.

Common grading standards

block trade

The proportion of bad beans

Bean size

Soybean grain hardness

Single coffee (specialty coffee)

Name of the farm where it is produced

Organic cultivation (organic)

Fair trade (fair trade)

African countries-Kenya kenya